package util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class MyBatisUtil {
    //会话工厂创建
    private static SqlSessionFactory sqlSessionFactory;
    //使用单例模式创建会话工厂对象 使用静态代码块 类加载时候执行一次
    static{
        //定义mybatis核心配置文件
        String resource="mybatis-config.xml";
        //流操作
        InputStream inputStream=null;
        try {
            inputStream=Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static SqlSession getSession(){
        return sqlSessionFactory.openSession();
    }
}
